Refractory period — In physiology, a refractory period is a period of time during which an organ or cell is incapable of repeating a particular action, or (more precisely) the amount of time it takes for an excitable membrane to be ready for a second stimulus once… … Wikipedia

repolarization — noun Date: 1922 restoration of the difference in charge between the inside and outside of the cell membrane following depolarization • repolarize verb … New Collegiate Dictionary

Electrocardiogram — An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm ) is a noninvasive transthoracic graphic produced by an electrocardiograph, which records the electrical activity of the heart over time. Its name is made of… … Wikipedia

Revolutionary Communist Party, USA — The Revolutionary Communist Party, USA (RCP, USA), known originally as the Revolutionary Union, is a Maoist communist party formed in 1975 in the United States. The RCP states that U.S. imperialism will never peacefully change and that the only… … Wikipedia